https://bugzilla.kernel.org/show_bug.cgi?id=43068
Summary: Operation restricted to levels L0-2 - kerneloops when
booting L3
Product: Virtualization
Version: unspecified
Kernel Version: 3.2.0-2-amd64
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: kvm
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=72845)
--> (https://bugzilla.kernel.org/attachment.cgi?id=72845)
Kernel oops backtrace
Trying to run KVM with a high level of nesting works fine for the first two
levels of virtual machines (L1 and L2) but leads to the attached oops when
attempting to boot into L3.
The host system has 24 Xeon X5675 cores running Ubuntu 12.04 with kernel
3.2.0-21-generic. The nested VMs are restricted to one of these core. They all
run resized clones of a Debian wheezy (testing) image with kernel
3.2.0-2-amd64.
In the Turtles paper, nested virtualisation has been presented to support Ln
and includes L3 in the diagrams but the evaluation only went up to L2. The
kernel documentation nested-vmx.txt doesn't list this as a restriction but
doesn't mention L3 or higher either. Hence, it is not clear if the
implementation is supposed to support L3 at all, at the moment or in the
foreseeable future.
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